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No. 770,679. PATENTED SEPT. 20, 1904. J. A. DAHLQVIST & G. L. HOLM. GBNTRIFUGAL LIQUID SEPARATOR.

APPLIGATION FILED MAY 26. 1902.

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NO MODEL.

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miyaa 4w I BY 'f] "ATTORNEY & E S S E N H W No. 770,679. PATENTED SEPT. 20, 1904. J. A. DAHLQVIST & O. L. HOLM. CENTRIFUGAL LIQUID SEPARATOR.

APPLICATION FILED MAY 26. 1902.

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N0 MODEL.

INVENTORS= WITNESSES:

ATTORNEY v No. 770,679. PATENTED SEPT. 20, 1904.

J. A. DAHLQVIST & G. L. HOLM. OENTRIFUGAL LIQUID SEPARATOR'.

APPLICATION FILED MAY 26. 1902. V N0 MODEL. 3 SHEETSSHEET 3. Q

I Q g 8 ill-r1117 uid mass being treated.

UNITED STATES Patented September 20, 1904;.

ATENT J OI-IAN ALFRED DAHLQVIST AND CARL LUDVIG HOLM, OF STOOKHOLM, SWEDEN, ASSIGNORS TO NYA AKTIEBOLAGET RADIATOR, OF STOCK- HOLM, SWVEDEN.

CENTRIFUGAL LIQUlD-SEPARATOR.

SPECIFICATION forming part of Letters Patent No. 770,679, dated September 20, 1904. Application filed May 26, 1902. erial No. 108,964. (No model.)

To all whom it may concern.-

Be it known that we, JoHAN ALFRED DAHL- vIs'r and CARL LUDvIe HoLM, both subjects of the King of Sweden and Norway, and residents of Stockholm, Sweden, have jointly invented certain new and useful Improvements in Liquid-Separators, of which the following is a specification.

This invention relates to the class of centrifugal apparatus employed for separating fatty substances from emulsions thereof such as cream from blue milk, for example. Numerous devices have been and are employed for this purpose, one well-known class having plates or disks mounted in the bowl or drum and sloping radially downward from the axis or center toward the periphery. These plates serve to guide the lighter particles of the fluid toward the axis of the bowl and the heavier particles toward the periphery thereof. Investigation seemsto show that the useful effect of these disks or plates is proportioned to the quantity of liquid being treated and to the rotary velocity imparted to the bowl.

It is well understood that the centrifugal eflect on the liquid in a rotating bowl increases toward the periphery for obvious reasons, and it is probable that the increase of pressure on the liquid from this cause does not in itself effect the separation of the lighter from the heavier particles of the liq- Consequently it is of importance to facilitate the separation by such means as will hasten the delivery of the lighter particles from the incarcerating mass of heavier liquid thrown outward and to guide the same to the central column formed of these lighter particles; and it is the object of the present invention now to be described to attain this end by a novel construction of the features within the bowl.

In the accompanying drawings, which illustrate embodiments of the invention, Figure 1 is an axial vertical section of the apparatus, and Fig. 2 is a plan view with the cover of the bowl removed. Figs. 3 and 4 are views respectively similar to Figs. 1 and 2 and illustrating a modified construction. Figs. 5 and 6 are also views respectively similar to Figs. 1 and 2 and illustrating another modification of the construction.

In order that the invention may be the bet ter understood, we have shown three forms of the construction of the parts within the bowl, which parts constitute a liner. The bowl and its cover are of the usual form and will require no description, and in all of the constructions herein illustrated the liner has as its base a hollow cone 1, which divides the hollow of the bowl into an interior and an exterior chamber.

Referring primarily to Figs. 1 and 2, it will suflice to say that the bowl is carried by and driven by an upright shaft; that the milk to be treated is led into the bowl at the top through a pipe 4: and enters an axial chamber 5 in the upper part or cover of the bowl; that from this chamber 5 it is led downward and outward through distributing-pipes 6; that the heavier fluid or blue milk is discharged through pipes 7 and that the lighter cream is discharged at the cream-outlet 8. On the inner face of the cone 1 are fixed plates 2, which extend edgewise in toward the bowl-axis. In the construction as seen in Fig. 2 six of these inner guide-plates are shown equally distributed about the cone. These plates are somewhat spirally arranged, being oblique to lines parallel with the axis of the bowl with their upper ends inclined backward in relation to the direction of rotation of the bowl, and this obliquity tends to retard the fiow of the the liquid moving over their surfaces. On the exterior face of the cone 1 are secured outer guide-plates 3. These plates, also six in number, extend upward from the free bottom edge of the cone 1 and are spirally arranged or oblique to lines parallel to the axis of the bowl. The obliquity is the reverse of that of the guide-plates 2. The inner edges of the plates 3 fit closely to the cone andthe outer edges thereof may be close to the inner surface of the bowl-wall.

The operation is as follows: The bowl being set in rapid rotation and the milk adduce an effect on the milk similar to compression, although the result is not really the same, as liquids are not compressible. The fluid when it descends to the free lower edge of the cone 1 passes out to the pheripheral annular space between the cone and the bowlwall, and then it flows upward between the exterior guide-plates 3. This annular space exterior to the cone gradually widens upwardly owing to the taper of the cone. The lighter particle's collect at the side toward the cone and move upward to the cream-outlet 8, while the blue milk or heaver liquid next the bowl-wall flows off at the outlets 6.

In the modified construction illustrated in Figs. 3 and 4 only four plates 2 and 3 are shown. The inclination to the horizon of the exterior guide-plates is not so great as in Figs. 1 and 2. Also these plates do not fit closely to the cone throughout their entire lengths, but are so fixed to the cone as to leave narrow slit-like passages next the cone for the upward flow of the gathered cream along the cone-wall.

In the modified construction illustrated in Figs. 5 and 6 the guide-plates 3 exterior to the bowl are in the form of horizontal rings,

{ which incline downward at their outer edges.

In this construction the fluid exterior to the cone will not have a greater angular velocity than the bowl; but the inclination downward in a radial direction produces a similar result. In this constructionnarrow spaces or slits are provided between the plates and the cone for the same reason that such passages are left in the construction of Figs. 2 and 3.

Having thus described our invention, we claim 1. In an apparatus for the purpose specified, the combination with a bowl having an inlet for the liquid to be separated, and outlets for the separated liquids, of a liner in the bowl, comprising a cone elevated above the bottom of the bowl so that the liquid may pass under it, and having an inlet above for the liquid entering the bowl, inner guide-plates 2 on the wall of the cone and inclined obliquely to lines parallel with the axis of the bowl, and outer guide-plates 3 on the exterior surface of the cone, said plates being also inclined obliquely to lines parallel with the said axis.

2. In an apparatus for the purpose specified, the combination with a bowl having an inlet for the liquid to be separated, and outlets for the separated liquids, of a liner in the bowl, comprising a cone elevated above the bottom of the bowl so that liquid may pass under it and having an inlet above for the liquid entering the bowl, inner guide-plates 2 on the wall of the cone and inclined obliquely to lines parallel with the axis of the bowl, and outer guide-plates 3'on the exterior surface of the cone, said plates being also inclined obliquely to lines parallel with the said axis and having narrow spaces at points between their inner edges and the cone for the direct upward flow of the lighter liquid.

3. In an apparatus for the purpose specified, the combination with a bowl having an inlet for the liquid to be separated, and outlets for the separated'liquids, of a liner in the bowl, comprising a cone elevated above the bottom of the bowl, so that liquid may pass under it, and having an inlet above for the liquid entering the bowl, inner guide-plates 2 on the wall of the cone and inclined obliquely to lines parallel with the axis of the bowl, and outer guide-plates 3 on the exterior surface of the cone, said plates being inclined obliquely to lines parallel with the said axis and in the form of horizontal rings.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

JOHAN ALFRED DAHLQVIST. CARL LUDVIG HOLM.

Witnesses:

ERNST SVANQVIST, AUG. SoRANsoN. 

